“At a time when stock portfolios are plunging and many homes, even grand ones, have no equity left to borrow against, an increasing number of art owners are realizing that an Old Master or a prime photograph, when used as collateral, can bring in much-needed cash. … This little-known corner of the art business is lightly regulated and highly litigious. But this has not dissuaded clients who have included rich collectors like Veronica Hearst, art galleries and prominent artists themselves, including [Annie] Leibovitz and Julian Schnabel.”